THE PERFORMANCES OF THE ANTENNAS IN ACTIVE PASSIVE COMPOUNDED GUIDANCE PART-I - BROAD-BAND ANTENNAS AND PASSIVE DIRECTION-FINDING SCHEMES/

Part one of a two-part paper analyses the performances of the ultra br oad-band antennas which are the key components in the broadband passiv e guidance in details. Two kinds of passive direction-finding schemes which have wide fields of vision are raised and analyzed in this part. Because of the uncertainty of the phase-centers of the antennas, the usual amplitude sun-subtraction monopulse technique can not be used to find the direction of a radiative source in a wide frequency range. A beam-operation network which can be used to form two secant beams fro m single broad-band spiral antenna is able to applied in the amplitude -monopulse system. An algorithm to eliminate the angle-confusion in th e amplitude-phase monopulse direction-finding system is also studied.